Regular Expressions 101

Group 1(\D*)

\D*any character that's not a digit, repeated any number of times

Group 2(\d)

\da digit

Non-Capturing Group(?:(\n|$)|(\D*)(\d)((?:\n|$)?))

1st Alternative(\n|$)

Group 3(\n|$)

1st Alternative\n

\na line-feed (newline) character (ASCII 10)

2nd Alternative$

$end of line

2nd Alternative(\D*)(\d)((?:\n|$)?)

Group 4(\D*)

\D*any character that's not a digit, repeated any number of times

Group 5(\d)

\da digit

Group 6((?:\n|$)?)

Non-Capturing Group(?:\n|$)?

?repeats the group contents below at most once:

1st Alternative\n

\na line-feed (newline) character (ASCII 10)

2nd Alternative$

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(\D*)(\d)(?:(\n|$)|(\D*)(\d)((?:\n|$)?))

012df3g4h5j6 78
012df3g4h5j6 7
012 3 45 6 78
012 3 45 6
012345678
01234567
01234567
012df3g4h5gh8

\2\5 \3\6